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Polymer Encapsulated Cobalt‐Based Catalysts (Co EnCat TM ) for Selective Continuous Hydrogenation of 1‐Iodo‐4‐nitrobenzene
Author(s) -
Alex Hannes,
Loos Patrick,
Baramov Todor,
Barry John,
Godiawala Tanmay,
Hassfeld Jorma,
Steinfeldt Norbert
Publication year - 2017
Publication title -
chemcatchem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.497
H-Index - 106
eISSN - 1867-3899
pISSN - 1867-3880
DOI - 10.1002/cctc.201700391
Subject(s) - nitrobenzene , catalysis , cobalt , aniline , selectivity , chemistry , flow chemistry , yield (engineering) , materials science , heterogeneous catalysis , inorganic chemistry , polymer chemistry , nuclear chemistry , organic chemistry , metallurgy
New cobalt catalysts confined in an EnCat TM polyurea matrix by micro‐encapsulation of Al 5 Co 2 or Al 5 Co 2 /Al 3 Ni 2 phase containing alloys are disclosed for the reductive hydrogenation of 1‐iodo‐4‐nitrobenzene 1 . The product 4‐iodo‐aniline 2 readily undergoes hydro‐desiodination and was used to demonstrate the extraordinary selectivity. Co EnCat TM significantly suppressed this follow‐up reaction under both batch and flow modes. The correlation between performance, elemental composition, and alloy content is presented for these novel catalysts. Among them, the hybrid micro‐encapsulated Co‐Ni catalyst showed higher activity than its Ni‐free analogue. In the flow process, this catalyst gave a high yield of 2 and very low level of 3 . Hence, these novel Co EnCat TM catalysts hold promise with respect to the continuous‐flow hydrogenation of challenging halogenated nitroaromatic compounds.